Apparently harmless.

https://bugzilla.redhat.com/show_bug.cgi?id=783955

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=656899:

Sounds like it's a warning for developers as part of a trace of SCSI
ioctls. Look like it was patched in newer kernels.

-- 
Drew

"Nothing in life is to be feared. It is only to be understood."
--Marie Curie

"This started out as a hobby and spun horribly out of control."
-Unknown